Description of the flag

On a black field, a circular seal consisting of a white ring with the text 'County of' and 'State of Illinois', and across the upper part of the seal, a blue bar with the word CLINTON, and below it the field split diagonally, with a
sailboat on blue on the left, and a pattern of black spots on white on the right.
Source: http://www.clintonco.org/Dov Gutterman, 8 November 2002